It is made of high-density plastic materials, simple to use, lightweight and easy to clean, waterproof plastic coating makes it easy to prevent bacterial growth within components. It is composed of two plastic-coated, closed-cell foam head supports, a universal attachment base and two durable head straps. Base plate fits all aluminum and plastic backboards.Large ear holes for monitoring the patient. Minimal interference with X-ray, MRI, or CT procedures.Will not absorb blood or bodily fluids.